The Electron-Recoil Response Tail and the LZ High-Energy Event Background
Abstract
We reconstruct the continuum electron-recoil contribution to the LZ background expectation from the collaboration's released simulation configuration. The released model specifies a definite response tail, but the published calibration information supplies no bound on how far the physical tail may depart from it at the probabilities the expectation depends on. Distributions reproducing the executable model's mean, variance, and standardised skewness exactly, and its event-conditioned 10, 50, and 90\% Ne quantiles to about one per cent, differ in the relevant tail probability by more than five orders of magnitude. The ladder is short: a tail agreeing with that central characterisation to 0.14\% in the quantiles lifts the electron-recoil contribution out of the negligible range, and one agreeing to 0.47\% makes it comparable to the entire background quoted for the comparison region. We go on to identify the measurements that would settle it.
Related
- Explaining the LZ High-Energy Recoil Event with Inelastic Sneutrino Dark Matter in Supersymmetry
- A Freeze-In Interpretation of the LZ High-Energy Nuclear Recoil Event
- A Comprehensive Interpretation of the LZ High-Energy Recoil Event: A Minimal U(1)B Dark Sector and Its Experimental Tests
- Higgsino dark matter compatible with the LUX-ZEPLIN high-energy nuclear-recoil event and IceCube constraints
- Recoil-enhanced temporal electron compression
BibTeX
@misc{bandyopadhyay2026electronrecoil,
title = {{The Electron-Recoil Response Tail and the LZ High-Energy Event Background}},
author = {Triparno Bandyopadhyay and Rajarajeswari Ramasamy and Nishitha TP},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.27105},
eprint = {2610.27105},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.27105},
}
RIS
TY - UNPB
TI - The Electron-Recoil Response Tail and the LZ High-Energy Event Background
AU - Triparno Bandyopadhyay
AU - Rajarajeswari Ramasamy
AU - Nishitha TP
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.27105
UR - https://arxiv.org/abs/2610.27105
AB - We reconstruct the continuum electron-recoil contribution to the LZ background expectation from the collaboration's released simulation configuration. The released model specifies a definite response tail, but the published calibration information supplies no bound on how far the physical tail may depart from it at the probabilities the expectation depends on. Distributions reproducing the executable model's mean, variance, and standardised skewness exactly, and its event-conditioned 10, 50, and 90\% N_e quantiles to about one per cent, differ in the relevant tail probability by more than five orders of magnitude. The ladder is short: a tail agreeing with that central characterisation to 0.14\% in the quantiles lifts the electron-recoil contribution out of the negligible range, and one agreeing to 0.47\% makes it comparable to the entire background quoted for the comparison region. We go on to identify the measurements that would settle it.
ER -